Minister and intelligence services meet to discuss security for Games that includes opening ceremony on the Seine

The French interior minister, Gérald Darmanin, has met intelligence services to assess the terrorist threat to the country, after the Moscow concert hall attack claimed by Islamic State raised fresh security fears over the Paris Olympics.

One of the biggest security challenges facing the organisers of the Games in the French capital is to protect the opening ceremony on 26 July. It is planned to be an unprecedented, open-air extravaganza, which for the first time in Olympic history will not take place within the confines of a stadium, but instead involve a flotilla of 94 boats carrying thousands of waving athletes down a 6km (3.7-mile) stretch of the Seine, followed by a further 80 boats carrying media and security, while an estimated 222,000 people gather along the river’s edge and 200,000 more watch from buildings.